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  <title>Writes data to fd with optional truncation at length</title>
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  <div id="layout-content"><div id="function.dio-write" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">dio_write</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.2.0, PHP 5 &lt; 5.1.0)</p><p class="refpurpose"><span class="refname">dio_write</span> &mdash; <span class="dc-title">
   Writes data to fd with optional truncation at length 
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.dio-write-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>dio_write</strong></span>(<span class="methodparam"><span class="type">resource</span> <code class="parameter">$fd</code></span>, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$len</code><span class="initializer"> = 0</span></span>): <span class="type">int</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>dio_write()</strong></span> writes up to <code class="parameter">len</code> 
   bytes from <code class="parameter">data</code> to file <code class="parameter">fd</code>. 
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.dio-write-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">fd</code></dt>

     <dd>

      <p class="para">
       The file descriptor returned by <span class="function"><a href="function.dio-open.html" class="function">dio_open()</a></span>.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">data</code></dt>

     <dd>

      <p class="para">
       The written data.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">len</code></dt>

     <dd>

      <p class="para">
       The length of data to write in bytes. If not specified, the 
       function writes all the data to the specified file.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.dio-write-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the number of bytes written to <code class="parameter">fd</code>.
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.dio-write-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.dio-read.html" class="function" rel="rdfs-seeAlso">dio_read()</a> - Reads bytes from a file descriptor</span></li>
   </ul>
  </p>
 </div>

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